A duet of coucals
The Greater Coucal is resident in Hong Kong all year round, but like other members of the cuckoo tribe, becomes more prominent in spring when its hooting song resounds. In the valley of Chung Chi stream at the Chinese University of Hong Kong, coucals have been calling this month. On April 11th, a typical song was answered by a second bird at a lower pitch. Like many birds, pairs of coucals sing duets, either together or in sequence, as on this occasion. The female coucal, being larger than the male, has the lower-pitched song.
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